OSPF Adjacencies taking too long to form

[JoshGarmonCiscoCCNA]

I have Area 0 and Area 8

The Router in Area 8 and the ABR Router took too long to form an adjacency on the link inside Area 8...it took like over a mintue.

I thought I had done something wrong.

I don't know if it's just a Packet Tracer bug or this is common...?

They're both Cisoc 1941' s

[paul driver]

Hello

Ospf  adjaceneys can take sometime depending on the network type being used

Usually broadcast/nonbroadcast network types due to the DR/BDR election process 

sh ip ospf interface x/x

res

paul

[Masoud Pourshabanian]

Hello,

Depending on OSPF network type and also available resources and CPU usage and so on, it may take longer than normal, but in test enviremont with fastethernet and serial interfaces, it should not be so long. What is the type of link between two routers? If it is Serial, It should take 2 to 10 seconds.

Try to change " hello" interval in both routers to see whether the result changes or not. Change it under interfaces participating in OSPF.

Inerface [ name]

ip ospf hello-interval 2

Please get back with the result.

Masoud

[barnesp]

Using the command mentioned by Paul Driver - shut down all interfaces on connected to the subnet you want to test and then bring them up.  By default all devices wait 40 seconds listening to see who should become the DR/BDR.  40 seconds is taken from the value of the OSPF hold-timer.  To prevent this you would need to change the network time but this would depend on your topology - which you haven't shared.

[Jon Marshall]

This is one of the reasons (among others) that I like EIGRP so much :-)

Jon

[barnesp]

Although EIGRP is not vendor independent - even though there is RFC published!  Fine for pure Cisco enviroments assuming queries are bounded :-)

[Jon Marshall]

Agreed.

I just like it because it is very flexible and OSPF can be somewhat inflexible within an area.

I have seen quite a few posts on here asking how to filter routes within an area or summarise within an area.

You can put some of it down to bad design but requirements do change.

But yes, EIGRP really needs a very good summarisation scheme to work well.

Nothing wrong with OSPF in general though.

Jon

[barnesp]

I like EIGRP too - it choosing the right too for the job

[paul driver]

Hello

only problem with eigrp is its Cisco proprietary

ospf is multi vendor

res

paul

[Jon Marshall]

Hi Paul

No offense but I think we all know that :-)

My initial response was based on the use of PT so I kind of assumed EIGRP was an option.

But yes that is the obvious difference between the two.

On a separate note how are the CCIE stuidies going ?

I keep expecting a post from you on these forums telling us you are now a CCIE !

Jon

[paul driver]

Hello Jon

None taken -

CCIE? - in no rush, for me its just a personal goal- 

Fitting in studies around work and personnel life is proving the most difficult plus my I’m sure my retention span is getting worst - However I’m enjoying the journey

Tip my hat to all who has completed this accreditation whatever the track and more so the multiple achievers

res
Paul

[Jon Marshall]

I also respect those with the certifcation and those trying for it.

I long ago came to the conclusion that I don't have either the focus or the attention span to attempt the CCIE because I realise how much effort it requires.

Your'e not the first person I have talked to who mentioned the trouble with retaining all the information so perhaps it's just one of those things you go through.

Regardless, wish you all the best with it and at least you are enjoying it with I think is the most important thing.

Jon

[barnesp]

Talking from someone who has taken the exam four times and failed I understand the sacrifices.

Looking back on stress is a big part of it. Particularly on the first two attempts where I was no where near ready. Something nasty happened on my forth attempt which was nothing to do with me.

3rd - put down to experience - mobile lab in London - poor nights sleep and poor environment compared to Brussels.

4th - was close - but no V4 places to retake anywhere in the world.

Anyway these are all excuses I wasn't good enough!

Family pressures and costs and the draconian retake intervals (since revoked) followed by death in the family have stopped me.  Will be getting back on the bus next year after recertifying my written and my NP level qualifications.

[paul driver]

Hello

good luck for the next time sure you will succeed eventually !